Authors: Mürsel DEMİREL, Ahmet SEMACAN, İbrahim TAŞAL
Abstract: Prostaglandin F2a was commonly used for synchronisation in mares. The purpose of this study was to see the effect of single and double doses of PGF2a on estrous, ovulation and pregnancy rates. Therefore 43 Thoroughbred mares, between 4-17 years old, were used. Thirty mares 10 mg PGF2a (Dinoprost Tromethamine, Dinolytic) was injected intramuscularly, regardless of the stage of the estrous cycle, for synchronization. Estrous behaviors and follicular development were examined with daily teasing and rectal palpation every other day, after PGF2a injection and ovulation times determined daily rectal palpation during estrous. The ma-res which in estrous (n: 11) natural service or artificial insemination with fresh semen were done every other day until estrous behavior lasted. The mares (n: 19), were not estrous after first PGF2a injection, were injected second PGF2a 14 days later and repe-ated all applications after first PGF2a injections. Control group (n: 13) were chosen from the mares which were not injected PGF2a in estrous and natural service or artificial insemination with fresh semen were done every other day until estrous behavior lasted. For pregnancy diagnosis, rectal palpation were done all mares between 30-35th and 60th days after ovulation. Estrous, ovulation and pregnancy rates obtained from first or second PGF2a injected mares and control group were 36.66%, 33.33% and 45.45%; 68.42%, 78.94% and 46.66; 100%, 92.30% and 53.84%, respectively. Consequently, because of no detrimental effect of PGF2a injections on estrous, ovulation and pregnancy rates, it was concluded that PGF2a injections for synchronization but, estrous and ovulation rates low in single dose injection therefore double doses injections would be more beneficial.
Keywords: Mare, PGF2a, estrous, ovulation and pregnancy rates.v
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